If you need a ball for oily lanes, the Vertigo is the one! STORM has incorporated a newly-formulated SFA coverstock, scuffed to an 800-grit matte finish, which maintains high-performance standards over time. On a heavily oiled pattern with moderate carry-down, the Vertigo revs up strong in the mid-lane and makes a dramatic turn at the break point. Dont take it from us, experience it for yourself. Youll be surprised with the backend reaction this ball produces despite the dull surface. Or polish the Vertigo up to 1500-grit to increase the backend snap! The pin action of the newly designed asymmetrical RAD3 weight block combined with the equally new SFA coverstock, will make your head spin!